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Microwave‐Hydrothermal Synthesis of Hierarchical Sb 2 WO 6 Nanostructures as a New Anode Material for Sodium Storage

2019; Wiley; Volume: 4; Issue: 3 Linguagem: Inglês

10.1002/slct.201803284

2365-6549

Ping Wang, Sanmu Xie, Yiyi She, Wenguang Fan, Michael K.H. Leung, Hongkang Wang,

Supercapacitor Materials and Fabrication

Abstract Novel hierarchical antimony tungstate (Sb 2 WO 6 ) nanostructures with hollow disk‐like morphology, which are layer‐by‐layer assembled from Sb 2 WO 6 nanosheets, are prepared by a facile microwave‐hydrothermal method. The as‐prepared Sb 2 WO 6 is firstly applied as an anode material for sodium ion batteries (SIBs), which shows superior cycle stability and rate capability, delivering a reversible capacity of ∼350 mA h/g after 100 cycles at 200 mA/g and even ∼285 mA h/g at a high rate of 2 A/g. The sodium storage mechanism is revealed via ex‐situ transmission electron microscope (TEM), X‐ray photoelectron spectroscopy (XPS) and X‐ray diffraction (XRD) analyses, which is based on the reversible alloying/dealloying reaction ( ) and the reversible conversion reaction ( ) in the ternary oxide of Sb 2 WO 6 . The different sodiation/desodiation reactions in the Sb 2 WO 6 electrode happens in a step‐wise manner owing to the different working potentials, which thus alleviate the volume change induced pulverization and synergistically contribute to the superior sodium storage performance.